package net.comm.friend.db;

import org.sakaiproject.db.api.iServiceSql;


/**
 * methods for accessing user data in a database.
 */
public class FriendServiceSqlMysql implements iServiceSql
{
	/**
	 * 返回根据主键删除语句
	 */
	public String getDeleteSql()
	{
		return "delete from Friends where (userID=? and friendID=?) or (friendID=? and userID=? )";
	}

	/**
	 * 返回插入语句
	 */
	public String getInsertSql()
	{
		return "insert into Friends (seqID, userID, friendID, teamID, status, mTime) values (?,?,?,?,?,?)";
	}
	
	/**
	 * 返回根据主键修改语句
	 */
	public String getUpdateSql()
	{
		return "update Friends  set userID=?,  friendID=?, teamID=?, status=?,  mTime=? where SeqID=?";
	}

	/**
	 * 返回修改状态
	 */
	public String getUpdstsSql()
	{
		return "update Friends  set status=? where (userID=? and friendID=?) or (friendID=? and userID=? )";
	}
	
	/**
	 * 返回根据主键查询语句
	 */
	public String getbykeySql()
	{
		return "select seqID,  userID, friendID, teamID, status, mTime from Friends where SeqID=?";
	}
	
	/**
	 * 返回根据会员ID查询语句 
	 */
	public String getByUserIDSql()
	{
		StringBuffer sb =  new StringBuffer("select seqID,  userID, friendID, teamID, status, mTime " +
				" from Friends");
		
		sb.append(" where UserID=? ");
				
		return sb.toString();
	}
	/**
	 * 返回根据判断是否是好友语句 
	 */
	public String getIsUserIDFriendSql()
	{
		StringBuffer sb =  new StringBuffer("select seqID,  userID, friendID, teamID, status, mTime " +
				" from Friends ");
		
		sb.append(" where UserID=?  and FriendID=?");
				
		return sb.toString();
	}
	/**
	 * 返回根据判断是否是好友语句 
	 */
	public String getByUserIDFriendSql()
	{
		StringBuffer sb =  new StringBuffer("select seqID,  userID, friendID, teamID, status, mTime " +
				" from Friends ");
		
		sb.append(" where UserID=?  and FriendID=? ");
				
		return sb.toString();
	}
	
	/**
	 * return the sql statement which updates an external user id for a given user in the sakai_user_id_map table.
	 */
	public String getRecbyPageSql()
	{
	
		StringBuffer sb =  new StringBuffer("select seqID,  userID, friendID, teamID, status, mTime from Friends ");
		
		sb.append(" where userID=? ");
		sb.append(" limit ?, ? ");
				
		return sb.toString();	
	}	
	
	/**
	 * return the sql statement which updates an external user id for a given user in the sakai_user_id_map table.
	 */
	public String getRecSql()
	{
	
		StringBuffer sb =  new StringBuffer("select seqID,  userID, friendID, teamID, status, mTime " +
				"from Friends ");
		
		return sb.toString();	
	}	

	/**
	 * 返回所有记录数
	 */
	public String getCountSql1()
	{
		return "select count(*) as COUNT from Friends ";
	}


	/**
	 * 返回根据查询条件的记录数
	 */
	public String getCountSql2()
	{
		return "select count(*) as COUNT from Friends where UserID=? ";
	}

	
	
	/**
	 * @see net.comm.job.db.iServiceSql.impl.UserServiceSql#getMaxInputsForSelectWhereInQueries()
	 */
	public int getMaxInputsForSelectWhereInQueries() {
		// For Oracle, the maximum supported number of expressions in a list is 1000. 
		return 1000;
	}
}
